Folded dual-band antenna apparatus

Abstract

A folded dual-band monopole antenna apparatus is disclosed, which includes a radiation body, a transmission line and a conductor. The radiation body resonates at a first and a second operating frequency. The radiation body connects the transmission line by way of the conductor. The radiation body includes a first side and a corresponding second side, and slits are set alternately on the first side and the second side to make the radiation body to be a meandered structure. The radiation body is folded along an extended direction of the slits to form a pillar structure for size miniaturization. The radiation body can cover a surface of a pillar dielectric material structure by printing technology for further size miniaturization and improving the strength of the radiation body.

What is claimed is:  
     
       1. A folded dualband antenna apparatus with a first operating frequency and a second operating frequency, comprising: 
       a radiation body with a first side and a second side corresponding to the first side, the radiation body including:  
       a plurality of slits, set alternately on the first side and the second side; and  
       a feeding point for defining a first current path and a second current path on the radiation body, wherein the length of the first current path is a quarter of a wavelength corresponding to the first operating frequency, and the length of the second current path is a quarter of a wavelength corresponding to the second operating frequency;  
       wherein the radiation body is folded along an extended direction of the slits to form a pillar structure;  
       a transmission line for transmitting signals; and  
       a conductor, connecting the transmission line and the feeding point of the radiation body.  
     
     
       2. A folded dual-band antenna apparatus according to  claim 1 , wherein the conductor and the radiation body are combined in a unity form. 
     
     
       3. A folded dualband antenna apparatus according to  claim 1 , wherein the radiation body is a rectangular metal plate. 
     
     
       4. A folded dual-band antenna apparatus according to  claim 1 , wherein the first operating frequency is about 900 MHz, and the second operating frequency is about 1800 MHz. 
     
     
       5. A folded dual-band antenna apparatus according to  claim 1 , wherein the directions of the slits are parallel to each other. 
     
     
       6. A folded dual-band antenna apparatus according to  claim 1 , further comprising a pillar dielectric material, the radiation body formed on the surface of the pillar dielectric material. 
     
     
       7. A folded dual-band antenna apparatus according to  claim 6 , wherein the pillar dielectric material is a ceramic material. 
     
     
       8. A folded dual-band antenna apparatus according to  claim 6 , wherein the radiation body is set on the surface of the pillar dielectric material using a printing technology. 
     
     
       9. A folded dual-band antenna apparatus according to  claim 1 , wherein the pillar structure is a rectangular pillar structure. 
     
     
       10. A folded dual-band antenna apparatus according to  claim 1 , wherein the pillar structure is a cylindrical structure.